/* var chengji=78;
if(chengji>100||chengji<0){
	console.log('成绩输入错误')
}
else if(chengji>=90){
	console.log('优秀')
}
else if(chengji>=80){
	console.log('良好')
}
else if(chengji>=70){
	console.log('中等')
}
else if(chengji>=60){
	console.log('及格')
}
else {
	console.log('不及格')
} */
/* for (var a = 8848, b = 0.0001, c = 0) {
	b *= 2;
	c++
} */
/* for (var a = 1; a <= 9; a++) {
	for (var i = 1, str = ''; i <= a; i++) {
		str += i + '*' + a + '=' + a * i + ' ';
	}
	console.log(str);
}
 */
/* var a=0.0001,b=0;
do {
	a*=2
	b++;
}while(a<1);
console.log(b) */
/* var str;
console.log(typeof str); */
var x=prompt("请输入1-5的数字","");                     
switch (x) {                            
    case “1”:alert(“one”);                            
    case “2”:alert(“two”);                            
    case “3”:alert(“three”);                            
    case “4”:alert(“four”);                            
    case “5”:alert(“five”);                            
    default:alert(“none”);
}